Quantitative Traits (p. 2), Photo by Peter Morenus/Courtesy of University of Connecticut; Reproductive Technology (p. 20), © R. Rawlins/Custom Medical Stock Photo; Reproductive Technology: Ethical Issues (p. 27), AP/Wide World Photos; Restriction Enzymes (p. 32), © Gabridge/Custom Medical Stock Photo; Ribosome (p. 43), © Dennis Kunkel/ Phototake; Rodent Models (p. 61), © Reuters NewMedia Inc./Corbis; Roundworm:

Caenorhabditis elegans (p. 63), © J. L. Carson/Custom Medical Stock Photo; Sanger, Fred (p. 65), © Bettmann/Corbis; Sequencing DNA (p. 74), © T. Bannor/Custom Medical Stock Photo; Severe Combined Immune Deficiency (p. 76), © Bettmann/Corbis; Tay-Sachs Disease (p. 100), © Dr. Charles J. Ball/ Corbis; Transgenic Animals (p. 125), Courtesy Cindy McKinney, Ph.D./Penn State University's Transgenic Mouse Facility; Transgenic Organisms: Ethical Issues (p. 131), © Daymon Hartley/Greenpeace; Transgenic Plants (p. 133), © Eurelios/Phototake; Transplantation (p. 140), © Reuters New Media/Corbis; Twins (p. 156), © Dennis Degnan/Corbis; X Chromosome (p. 175), © Gale Group; Yeast (p. 180), © Dennis Kunkel; Zebrafish (p. 182), Courtesy of Dr. Jordan Shin, Cardiovascular Research Center, Massachusetts General Hospital.


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